Bob from SWISCO responded:
July 21, 2021
This looks like either a Series 380 or Series 385 Channel Balance. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. Refer to the image below to determine what matches best. See the video below for further details. Comparison of the S380 and S385 balance shoes.
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